INDEX 



Pistil 604, 616, 617-620, 868 



Compound 619, f. 619 

 Pistillate flowers 605, f. 606, 607 

 Pitchforks syn. Beggar-ticks 

 Placenta 618, 868 

 Axillary f. 619 

 Central f. 619 

 Parietal f. 619 

 Plantaginaceae 296-307 

 Bibliography 5S6 

 Distribution 721, 762-763 

 Seed 474-476, 571-572 

 Plantago arenaria, Distribution 726 

 aristata 304-307, f. 306 



Distribution 720, 740, m. 307 

 Seed 474, 572, 810, f. !,7'i, 572 

 coronopus, Distribution 736 

 lanceolata 301-303, 787. 796, f. 302 

 Chemical composition 303 

 Distribution 696, 697, 698, 720, 



736, 762, TO. 302 

 Root system 654, f. 6J,8 

 Seed 475, 572, 810, f. 475, 571 

 major 297-299, 664, f. ,:9s, S99 

 Chemical composition 299 

 Distribution 696, 698, 720, 736, 



742, m. 299 

 Seed 475, 572, f. 1,75, 572 

 maritima, Distribution 736 

 media, Distribution 736 

 purshii 303-305, 787, f. 304 



Distribution TO. 305 

 rugelii 299-301, 788, f. 300 

 Distribution 720, m. 301 

 Seed 475, f. 475, 676 

 sp. 778 

 Plantain, Bracted 305-307, 740, f. 306 

 Distribution 720, m. 307 

 Seed 474, 571, 572, 810, 814, f. .J7.J, 

 572 

 Buck syn. Buckhorn 

 Common 297,299, 664, f. 29S, 299 



Chemical composition 299, 720, 742 

 Distribution 696, 698, 720, 742, to. 



299 

 Seed 475, 571, f. 476, 571 

 Dooryard sun. Common Plantain 

 Family 296-307 



Distribution 724, 735, 762-763 

 Seed 474-476, 571-572 

 Indian, Seed 493, f. 493 

 Prairie 303-305, f. 304 

 Distribution m. 305 

 Pursh's 787 



Rat-tail, Seed f. 63S 

 Ribbed syn. Buckhorn 

 Rugel's 299-301, 788, f. 300 

 Distribution 720, m. 301 

 Seed 475, 814, f. .',76, 676 

 sp. 637, 665. 667, 677, 708, 710, 736, 

 778, 785, f. 628 

 Root system 645 

 Plants, Dioecious 605 

 Monoecious 605 

 Polygamous 605 

 Plasmodiophora brassicae 677, 680 

 Plasticity of plants 706-707 

 Plum 175, 687 

 Plutella maculipennis 677 

 Plymouth Flora 845 

 Poa annua 664. 677. f. 59S 

 Distribution 715, 725 

 aracbnifera, Seed f. 6S9 

 compressa, Distribution 715 



Seed 418, 811, 812, f. 418, 639 

 Impurities of f. 639 

 nemoralis, Seed f. 639 

 pratensis f. 598 

 Distribution 715 

 Seed 418, 811. 812, f. 418, 639 

 sp. 693 



trivialis, Distribution 715 

 Seed f. 639 

 Pod 868 

 Poinsettia 205 



Poison Darnel 52-53, 520, 522-524, 692, 

 696, 699, 715 

 Hemlock 709, 710, 719, 728, 768-769, 



776 



Ivy 213, 214, 215, 652, 683, 787, S43 



Poisonous weeds 52, 53, 66, 67, 194, 



195, 213, 214, 215, 652, 683, 709, 



710, 715, 719, 728, 768-769, 776, 



• 7S7, 83S, 847, 848, S52, 853, 854 



Pokeweed 776 



Distribution 763 

 Polanisia graveolens 171-172, f. 112 

 Distribution 717, m. 172 

 trachysperma 171, 788, f. 173 

 Pollen 615-617, 869 

 causes disease 681 

 grains 616, 617 

 mother cells 616, f. 615 

 sacs 616, f. 616 

 Pollination 616, 869 

 Polygamous plants 606 

 Poltgonaceae 3, 74-99, 633 

 Bibliography 586 

 Distribution 715, 724, 763 

 Seed 425-431, 525-532 

 Polygonum acre 97, f. 96 

 Distribution 716 

 Seed 428, f. 42S 

 aviculare 84-S5, 663. 7SS, f. S4 

 Distribution 716, 736, 742, m. 84 

 Seed 428, 429, 431, 663, 677 

 convolvulus 97-99, 789, f. 98 



Distribution 696, 698, 716, S29, m. 



99 

 Seed 429, 528-531, f. 429, 526, 528, 

 529, 5S0, 531, 536, 7i9 

 dumetorum v. scandens 527 

 erectum 82-83, 789, f. 83 



Distribution 696, 716, 725, m. 83 

 Seed 429, 527, f. 4?9, 526 

 hydropiper 92-93, 594, 775, 789, f. 93 

 Distribution 734, 742 

 Seed 430, 527, f. 429. 526 

 hydropiperoides 95-97, 594, 788, f. 95 

 Distribution to. 96 

 Seed 430, f. 4Z9 

 lapathifolium 86-87, 788, f. 87 

 Distribution 716, 734, 742, m. 87 

 Seed 430, f. 430 

 muhlenbergii 88-90, 789, f. 88, S9 

 Distribution 716, m. 88 

 Root system 652 

 Seed f. 431 

 orientale, Distribution 763 



Seed 428, f. 428 

 pennsylvanicum 90-92, 594, 660, 664, 

 789, f. 91, 92 

 Seed 4 30, f. J,30 

 persicaria 92, 93-95, 665, 788, f 9', 

 Chemical composition 673, 674 

 Distribution 691, 716, 736, m. 95 

 Seed 430, 527, f. 430, 526, 676 

 ramosissimum 85-86, 789, f. 86 

 Distribution m. 86 

 Seed 431, f. .',31 

 SP. 691, 785 

 virginianum 527 

 Polytrichum commune. Distribution 693 

 Popenoe. E. A. 766 

 Poplar 605 



Distribution 695 

 Poppv 663, 665. f. 6SS 



Seed 440, 536-53S, f. \40, 537. 538 

 Corn f. 618 



Family, Distribution 724 

 Mexican, Distribution 696, 839 



